Acrolein scavengers
AssigneeBaker Hughes Incorporated
InventorsGlenn L. Roof, Dwight Reid
Life of this patent
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Abstract
A process for removing acrolein from a gaseous or liquid mixture, in one case aqueous solutions, involving contacting the mixture with a compound selected from the group consisting of sodium hypochlorite; an acid salt of hydroxylamine; a urea compound such as urea itself or thiourea; sodium bisulfite and 4,4-dimethyl-1-oxa-3-azacyclopentane in an amount effective to substantially remove acrolein has been discovered. The process works particularly well in selectively scavenging acrolein from aqueous solutions containing acrylonitrile.
Claims12
A process for removing acrolein from a gaseous or liquid mixture comprising contacting the mixture with a compound selected from the group consisting of sodium hypochlorite, an acid salt of hydroxylamine, a urea compound, and 4,4-dimethyl-1-oxa-3-azacyclopentane in an amount effective to substantially remove acrolein.
A process for removing acrolein from a gaseous or liquid mixture containing acrylonitrile comprising:
- (1) contacting the mixture with from about 10 ppm to about 20 wt. %, based on the total mixture of a compound selected from the group consisting of sodium hypochlorite;
- an acid salt of hydroxylamine;
- a urea compound;
- and 4,4-dimethyl-1-oxa-3-azacyclopentane;
- and
- (2) selectively removing substantially all of the acrolein.
A process for removing acrolein from a gaseous or liquid mixture comprising contacting the mixture with an acid salt of hydroxylamine in an amount effective to substantially remove acrolein.
The process of claim 7 where the an acid salt of hydroxylamine is used in an amount from about 10 ppm to about 20 wt. %, based on the total mixture.
A process for removing acrolein from a gaseous or liquid mixture containing acrylonitrile comprising:
- (1) contacting the mixture with from about 10 ppm to about 20 wt. %, based on the total mixture, of an acid salt of hydroxylamine selected from the group consisting of hydroxylamine hydrochloride, hydroxylamine sulfate and hydroxylamine acetate;
- and
- (2) selectively removing substantially all of the acrolein.
A process for removing acrolein from a gaseous or liquid mixture comprising contacting the mixture with a urea compound in an amount effective to substantially remove acrolein.
A process for removing acrolein from a gaseous or liquid mixture containing acrylonitrile comprising:
- (1) contacting the mixture with from about 10 ppm to about 20 wt. %, based on the total mixture, of a urea compound selected from the group consisting of urea and thiourea;
- and
- (2) selectively removing substantially all of the acrolein.
A process for removing acrolein from a gaseous or liquid mixture comprising contacting the mixture with 4,4'-dimethyl-1-oxa-3-azacyclopentane in an amount effective to substantially remove acrolein.
A process for removing acrolein from a gaseous or liquid mixture containing acrylonitrile comprising the steps of:
- (1) contacting the mixture with from about 10 ppm to about 20 wt. %, based on the total mixture, of 4,4'-dimethyl-1-oxa-3-azacyclopentane;
- and
- (2) selectively removing substantially all of the acrolein while removing essentially none of the acrylonitrile.
Dependencies are inferred from the claim text.